There are a multitude of ways! Some are free and some cost.
So, first up, free with wired connection. A app included with your OS is image capture. It is more of a image (Photo and Video) traffic cop. It recognizes a video device when it is plugged into your mac. It presents options on what you want to do with you pics, such as select photos to move to iPhoto, aperture, or any other graphic app on your mac.
Lets look at doing it free and wirelessly. Dropbox is a great way of moving ANY files from one device to another. DropBox works on your Mac, iPad, iPhone, and even your PC!
Paid solutions are suppose to make life easy. Well Photosync (1.99) is one of these apps that does exactly that. It allows you to sync photos to and from all of your devices. You can send 1, 10, 100 or all of your photos. It will even let you transfer videos from your camera too! It will allow you to place them in your dropbox.
I really did not want to mention iCloud because it is either on or off and there is no way of moving photos already existing.